"Stockpiling vegetable purees for covert use in children's food is an idea that cannot be copyrighted," the appeals court wrote.

Lapine, the author of "The Sneaky Chef: Simple Strategies for Hiding Healthy Foods in Kids' Favorite Meals," sued Jessica Seinfeld after over her cookbook titled: "Deceptively Delicious: Simple Secrets to Get Your Kids Eating Good Food." The Seinfeld book was published several months after Lapine's in 2007.

The fight reached a boil when Jerry Seinfeld made light of Lapine's claims during an appearance on CBS' "Late Show with David Letterman" in the fall of 2007, saying Lapine was accusing his wife of "vegetable plagiarism." Lapine's lawyers said Seinfeld, best known for the popular television comedy series "Seinfeld," used his Letterman appearance to launch a "malicious, premeditated and knowingly false and defamatory attack" on their client.

In court papers, lawyers for Jessica Seinfeld had accused Lapine of falsely claiming she invented the idea of hiding fruits and vegetables in children's meals when "countless prior works utilized this very same unprotectable idea," including a 1971 book.

Two appeals judges who participated in the ruling said they made their own comparison, finding that the total concept and feel of the books were "very different."

They also noted that "The Sneaky Chef" used primarily black, gray and shades of brownish orange, while "Deceptively Delicious" utilized bright colors and more photographs.

In a ruling that paralleled a decision last year by a lower court judge, the appeals court said the two cookbooks lacked the substantial similarity required to support a copyright infringement claim. And they said there was no chance of confusion by book buyers.

Lawyers for Lapine did not immediately return phone messages for comment.

Seinfeld lawyer Orin Snyder in a statement called Lapine's claims "an abuse of the judicial system."

"Two different courts have now seen through these false allegations, and that is why this case has been definitively thrown out of court," he added.